Sourced from psutil's changelog.

5.9.1

2022-05-20

Enhancements

• 1053_: drop Python 2.6 support. (patches by Matthieu Darbois and Hugo van Kemenade)
• 2050_, [Linux]: increase read(2) buffer size from 1k to 32k when reading /proc pseudo files line by line. This should help having more consistent results.
• 2057_, [OpenBSD]: add support for cpu_freq()_.
• 2107_, [Linux]: Process.memory_full_info()_ (reporting process USS/PSS/Swap memory) now reads /proc/pid/smaps_rollup instead of /proc/pids/smaps, which makes it 5 times faster.

Bug fixes

• 2048_: AttributeError is raised if psutil.Error class is raised manually and passed through str.
• 2049_, [Linux]: cpu_freq()_ erroneously returns curr value in GHz while min and max are in MHz.
• 2050_, [Linux]: virtual_memory()_ may raise ValueError if running in a LCX container.
• 2095_, [Linux]: net_if_stats() returns incorrect interface speed for 100GbE network cards

5.9.0

2021-12-29

Enhancements

• 1851_, [Linux]: cpu_freq()_ is slow on systems with many CPUs. Read current frequency values for all CPUs from /proc/cpuinfo instead of opening many files in /sys fs. (patch by marxin)
• 1992_: NoSuchProcess_ message now specifies if the PID has been reused.
• 1992_: error classes (NoSuchProcess, AccessDenied, etc.) now have a better formatted and separated __repr__ and __str__ implementations.
• 1996_, [BSD]: add support for MidnightBSD. (patch by Saeed Rasooli)
• 1999_, [Linux]: disk_partitions()_: convert /dev/root device (an alias used on some Linux distros) to real root device path.
• 2005_: PSUTIL_DEBUG mode now prints file name and line number of the debug messages coming from C extension modules.
• 2042_: rewrite HISTORY.rst to use hyperlinks pointing to psutil API doc.

Bug fixes

... (truncated)

• 992dfe4 pre release
• 7410b63 merge with master
• f1f2995 [Linux] Speedup Process.full_memory_info() (#2108)
• 1d41e8f shorten test by using spawn_testproc()
• 3398175 #2105: give hint on how to solve the problem if PdhAddEnglishCounter fails
• 51cd847 update doc
• 6ab8a54 Drop Python 2.6 support (#2099)
• b135380 Merge branch 'master' of github.com:giampaolo/psutil
• e8ee870 give CREDITS for #1053
• 83bb5f8 Use a generator to avoid a needless list allocation (#1567)
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